14.254 Verify-seqop used on non-endorsement

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Origin: check. Landing-place: diagnose.

Verify-seqop used on non-endorsement: R

The verify sequent operator applied to a sequent << P ,, C ,, s endorse x >> yields << P ,, C ,, x >> provided the side condition s is true. Thus, the verify operator allows to remove a satisfied side condition. The 'Verify-seqop used on non-endorsement' indicates that the conclusion of the sequent did not have form s endorse x. The error may indicate an error in the proof or a bug in a tactic.

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